在 AiVideo 中能看到图像

增加了在线状态同步逻辑

SHH.CameraService/Interceptors/ProtocolContext.cs

@@ -0,0 +1,37 @@
+namespace SHH.CameraService;
+
+/// <summary>
+/// 协议上下文 (用于在拦截器之间传递数据)
+/// </summary>
+public class ProtocolContext
+{
+    public string Protocol { get; set; }
+    public byte[] Data { get; set; }
+
+    /// <summary>
+    /// 是否拦截/终止 (设为 true 则不再继续传递)
+    /// </summary>
+    public bool IsBlocked { get; set; } = false;
+
+    public ProtocolContext(string protocol, byte[] data)
+    {
+        Protocol = protocol;
+        Data = data;
+    }
+}
+
+/// <summary>
+/// 拦截器接口
+/// </summary>
+public interface IProtocolInterceptor
+{
+    /// <summary>
+    /// 发送前触发 (Outbound)
+    /// </summary>
+    Task OnSendingAsync(ProtocolContext context);
+
+    /// <summary>
+    /// 接收后触发 (Inbound)
+    /// </summary>
+    Task OnReceivedAsync(ProtocolContext context);
+}